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1. $x + y = 3$

A. $- 12$
B. $- 12$
C. $- 12$
D. $- 12$

Answer: Option D

Explanation:

x^3 +y^3 + 3xy
= (x+y)^3 - 3xy(x+y) + 3xy
=(3)^3 - 3.1.3 +3.1
= 27-9+3
=21

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